Fusible link.



J. ALSFASSER.

PUSIBLE LINK.

APPLICATION FILED AUG. 23, 1911.'

Patented sept.'24,1912.

.UNITED sTArEs rafrnrrr y JOSEPH ALSFASSER, OF CHICAGQ, ILLINOIS.

rUsIsLn LINK.

Specification of Letters Patent.

Patented sept. e1, 1912.

Applicationfiled August 28, 1911. Serial No. 645,589.

v operation.

For the attainment. of these ends, and the accomplishment of other new and useful ob-` jects, as will appear,"my invention consists in the features of novelty in the construction, combination and arral'lgernent of the several parts generally. described in the specification'and shown in the accompanying drawing, and more particularly pointed out in the appended claims.

In the specification Figure 1 is a view showing a device constructed in accordance with the principles of my invention; Fig. 2.

is a View of fusible material in position between two end pieces which are less suscepf tible to heat; Fig. 3 is a view partly in' section of a fusible link as shown. by Fig. 1 Fig. 4 illustrates the application of my fusible link. to a window sash movably mounted in a framei Fig. 5 is a view of a fusible link. as employed in connection with u tension chain; Fig. 6 is a side view of the same with the apertured plate in section.

In devices of this class it is customary to dispose the material most susceptible to heat in such a manner that the fusible material is not exposed to the atmosphere and is usually under a tension between two or more other members. In the present device the material most susceptible to heat is disposed so that it may be subjected to the action of heut. on all sides, and which is normally under compression. By having the fus1ble material under com )ression not only is a stronger joint or connection made, but also thti tuition of the fusible material is made nuire positivo. In the specilication the ma teriul most susceptible to heat is referred tous the fusiblematerial, but of course it is well known that ull the materials of bieb such n device usually constructedl ure fusible.

1teferring now more particularly to the drawing, chainv links 10 or other suitable or similar members are inserted through the 1 aperture 11 of a plate 12; On the other side of the plate there is disposed fusible mate- 'i'ial 13, having end pieces 14, preferably secured thereto in such a manner as by casting, and composed of a material less sus-v ceptible to the action of heat. 'lhese end members 14 are provided at their outer ends withtlpsor projections 15. The ends of the chaindinks 10 which protrude through the opening 11 are adapted to be positioned over the' projections 15 and to engage the fusible material between the two links. The end pieces 14 arethus spaced apart by the fusible material 13, and are preferably disposed at a slight angle to each other, the fusible material 13 being exposed to the action of heat or to the atmosphere on all sides. This is a feature of importance, for the reason that if the fusible material is disposed between or is covered by another material less susceptible to the heat, the other material must first be heated through before the fusible material is subjected to the melting degree of heat.. By having thefusible material exposed on all sides to the atmosphere the action of the heat is posi tive and sure, and does not depend for its transmission on other conductors of heat. It will also be noted that with this construction the fusible material 13 is under compression when the fusible link is in position, for when tension is exerted upon the chain links (see Fig. 1) they act as levers with the edges of the aperture 11 as fulcruins,

and tend to compress the fusible material between therend pieces let.

An application of my invention is shown in Fig. 4t, in which a Window sash lt'is movable in a frame 17 withcounter Weights 18 for balancing the window. lThe -window is preferably of tire proof construction, and

has grooves in the sides and at the bottom of the frame to receive a. chain 19, which is suitably connected to the Weights 18. In the outer face of the window sash, preferablynadjacent the lower edge of the sash vand communicating with the groove in the lower edge, is anopening through which the links of the cham 19 may protrude to engage and hold in compression between them fusible material 13, with endA pieces 14, similar to that shown in Fig. 1. When the window is raised and the fusible material is subjected to' a fusing degree of heat,

it melts, thereby permitting the linksv of the chain 19 to be' drawn through the openmg in the window` sash, and thereby releasin the balancing weights 18, causing 'thewindow 16 to fall. Itis sometimes desirable. to include av de' vice such as I have described in a single tension chain, and for this purpose the construction .of my device may be slightly varied, as shown byligs. 5 and 6, in which the4 apertured plat'eBO' is reduced in size, itb'ein'g'necessary only to provide a' structure of' suiiicient strength to. endure the strain placed'upon it.. In all other res ects it may befsimilar in construction to the form al-l readyj described. Intheabove mentioned 'lires-,a chain linkf 21 is shown, 'which ermits lthe ready removal or 'adjustment o the fusible link. The operation ofthis form is similar to that already, described, and as soonl as the fusiblema'terial 'lgis melted,

either one or botliof'the. links lOfre drawn -""f.f1; In- 'af fusbleflink, the' combination with ,fusible material-, of :enfi- 'whichfthesaid materiakislsposed 'and to which fit 'is`.secured, an apertured member, and Ineens' attending. through the member and pjsitinedf'by the end pieces,'whereby whenihe V1n tension the said material "is underv compression. 1

(pieces betweena In a fusible link, th Ombinaiion with material usibleat a predetermined'degree of heat of end pieces secured thereto withV pieces less' susceptible to heat secured to the material, spaced apai-ethereb and having outward projections and' lin for .chain astenings engaging-said projections and extending through the said aperture, the

projecting ends of the said chain-links having connection on the other side of the afper-v tnred memberwith tension members,where by lWhen the material is melted the end Amembers Will be drawn toward each other and the said links will be drawn through the said'aperture.

- In testimony Whereof \I have signed' my name to thisspeci'lication, in the presence of two subscribingvvitnesses, on this 19th day -ofAugust AJD. 1911. ,f

v p JOSEPH ALSFASSER. Witnesses:

NINA J. HALSNE,

Copies ot thisi'pat'ent may be obtained fm' ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

45 ble to heat, disposed on one side thereof, end- 

